Can I take ipill if am not sure whether the stuff remains inside me?

I had sex with my husband, he put out his pennies when it started to come out stuff, I am not sure?... if some stuff remains inside me, should I take I pill??? actually, it was our first sex, I still even don't know if I am virgin or not,we were having sex, when it was time time to come out stuff he put out, but, I am sure, can I takei-pill???